Big, black, silent,3 lights at each corner,triangle,wider then a 4 lane free way.

well me and my mom were driving in a firebird down the free way twords mountain dale when i looked up through the moon roof there was a giant flying trangle that was wider at the corners then a 4 lane freeway it was completly silent with 1 white light at each corner, were were going 60 mph, and the ufo was slowly overtaking the speed of the car until it just disappered over the horizon, until recently i thought this was just a milatary craft until i heard that other people have seen these flying triangles